Negative Chromatic Dispersion Generated by Introducing Curvature into Photonic Crystal Fiber

This is a modeling work, which aims to show that negative chromatic dispersion (CD) may be obtained in a PCF by fiber bending. Results from the study of negative dispersion could be employed in a new dispersion compensating technique. The proposed method does not require doping in the core, and does not require external cores. The minimum negative dispersion achieved by this method was -185000 ps/nm/km. Problems of bending losses and sensitivity of the dispersion with respect to deviations of geometry were studied.

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Photonic Crystal Fiber with Ultra-Flattened Chromatic Dispersion, Low Confinement and Bending Losses

IEEJ Transactions on Electronics Information and Systems ◽

10.1541/ieejeiss.129.1039 ◽

2009 ◽

Vol 129 (6) ◽

pp. 1039-1046 ◽

Cited By ~ 1

Author(s):

Feroza Begum ◽

Yoshinori Namihira ◽

Shubi Kaijage ◽

S. M. Abdur Razzak ◽

Nguyen Hoang Hai ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Chromatic Dispersion ◽

Crystal Fiber ◽

Bending Losses

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Proposed Square Lattice Photonic Crystal Fiber for Extremely High Nonlinearity, Birefringence and Ultra-High Negative Dispersion Compensation

Journal of Optical Communications ◽

10.1515/joc-2017-0095 ◽

2019 ◽

Vol 40 (4) ◽

pp. 401-410 ◽

Cited By ~ 7

Author(s):

Md. Ibadul Islam ◽

Kawsar Ahmed ◽

Shuvo Sen ◽

Bikash Kumar Paul ◽

Md. Shadidul Islam ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Dispersion Compensation ◽

Chromatic Dispersion ◽

Single Mode ◽

Square Lattice ◽

Geometrical Properties ◽

High Birefringence ◽

Crystal Fiber ◽

Negative Dispersion

Abstract A photonic crystal fiber in square lattice architecture is numerically investigated and proposed for broadband dispersion compensation in optical transmission system. Simulation results reveal that it is possible to obtain an ultra-high negative dispersion of about −571.7 to −1889.7 (ps/nm.km) in the wavelength range of 1340 nm to 1640 nm. Experimentally it is demonstrated that the design fiber covers a high birefringence of order 4.74×10‒3 at the wavelength of 1550 nm. Here, numerical investigation of guiding properties and geometrical properties of the proposed PCF are conducted using the finite element method (FEM) with perfectly match layers. Moreover, it is established more firmly that the proposed fiber successfully compensates the chromatic dispersion of standard single mode in entire band of interest. Our result is attractive due to successfully achieve ultra-high negative dispersion that is more promisor than the prior best results.

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Effect of Soft Glass Rod Infiltration in the Core of Photonic Crystal Fiber

Journal of Optical Communications ◽

10.1515/joc-2017-0201 ◽

2020 ◽

Vol 41 (4) ◽

pp. 371-383 ◽

Cited By ~ 1

Author(s):

Saleha Fatema ◽

Rubaya Absar ◽

Mohammad Istiaque Reja ◽

Jobaida Akhtar

Keyword(s):

Optical Properties ◽

Photonic Crystal ◽

Comparative Study ◽

Photonic Crystal Fiber ◽

Soft Glass ◽

Crystal Fiber ◽

The Core ◽

Negative Dispersion ◽

Operating Wavelength ◽

Very High

AbstractThe effect of core infiltration in the optical properties of Photonic Crystal Fiber (PCF) is investigated. The soft glass rod infiltration provides greater refractive index contrast between the core and the cladding. This modification improves the optical properties significantly. Four structures of photonic crystal fiber (Hexagonal, Octagonal, Decagonal and Elliptical) are investigated and a comparative study has been made to observe the difference in the optical properties due to the infiltration. It is observed that, by introducing this infiltration the birefringence is improved up to the order of $10^{-1}$ and a very high negative dispersion coefficient of 7744ps/(km.nm) can be achieved. The birefringence is increased $4.82\times10^{6}$ times in the hexagonal PCF, $5.38\times10^{5}$ times in octagonal PCF, 546 times in decagonal PCF and about 8 times in the elliptical PCF at operating wavelength due to the core infiltration. The positive dispersion of the fiber is eliminated and a very high negative dispersion co-efficient of 7744ps/(km.nm) is achieved in hexagonal PCF, a relatively flattened dispersion is obtained in other cases due to infiltration at operating wavelength. The nonlinearity is increased about 73 times in case of hexagonal PCF and in other cases it is increased about 2 times. The confinement loss is reduced up to the order of $10^{-11}$ due to the infiltration at the operating wavelength of 1550 nm. Another comparative study shows that the introduced fibers outperform most of the recent works with a more simple structure, which reduce fabrication complexity. The numerical investigation of the structures is conducted using full vector finite element method.

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